html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
}

.container {
  display: flex;
  justify-content: space-around;
  align-items: center;

  height: auto;
  width: 100%;
}

.control-panel {
  display: flex;
  height: 400px;
  flex-direction: column;
  justify-content: space-around;
}

input,
label,
button {
  width: 120px;
}